Correct option is B
The error is in part (B).
Corrected Sentence:
"The cat escaped through the open window before anyone could catch it."
Explanation:
· "Though" (incorrect) means "although" or "despite."
· "Through" (correct) means "moving in one side and out the other side of something," which is the correct meaning here.
Thus, the correct answer is: ✔ (b) B ✅